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Graphene on Chromia: A System for Beyond-Room-Temperature Spintronics
Keke He1, Bilal Barut1, Shenchu Yin1
1Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, New York, 14260, USA.
Advanced Materials (Deerfield Beach, Fla.)
|January 5, 2022
Summary
Spin-dependent transport in graphene on chromia is robust, even above room temperature. This discovery paves the way for advanced spintronic devices operating at high temperatures.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Graphene exhibits unique electronic properties.
- Antiferromagnetic/magneto-electric materials offer novel functionalities.
- Combining these materials is key for next-generation electronics.
Purpose of the Study:
- To investigate spin-dependent transport in graphene/chromia heterostructures.
- To assess the temperature stability of spin signals.
- To explore potential applications in spintronics.
Main Methods:
- Fabrication of monolayer graphene on chromia (Cr2O3) (0001) surface.
- Non-local spin-Hall geometry measurements.
- Temperature-dependent transport characterization.
Main Results:
- Robust spin-dependent transport observed in graphene/Cr2O3.
- Significant spin signal detected at zero magnetic field.
- Spin signal persists up to 450 K, well above the Néel temperature (307 K).
Conclusions:
- Graphene-on-chromia heterostructures demonstrate strong spin-dependent transport.
- The observed phenomenon is consistent with theoretical predictions of induced spin-orbit coupling.
- These heterostructures are highly promising for high-temperature spintronic devices.
